feat: dochazka Excel export + auto-reload + 162 filter

- Add dochazka Excel export using direct ZIP/XML manipulation of template
  (preserves styles.xml byte-for-byte to avoid Excel "repaired styles" warning)
- Calculate per-person stravné doplatek, transport (AUV), and indiv1
  (closure count + Janouš internet) per sichtovnice.py logic
- Filter exported people to TEMPLATE_NAMES (12 fixed template rows)
- Add server version polling + auto-reload on deploy
- Add FPD check modal for monthly hour validation
- Add "162" filter button to hide first 5 TKB people from view

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/server.js

@@ -9,7 +9,8 @@ const __filename = fileURLToPath(import.meta.url)
 const __dirname = dirname(__filename)
 
 const app = express()
-const PORT = 3080
+const PORT = process.env.PORT || 3090
+const SERVER_VERSION = Date.now().toString()
 
 const SCHEDULES_DIR = join(__dirname, 'schedules')
 const SAVED_SCHEDULE_PATH = join(__dirname, 'saved_schedule.json')
@@ -198,6 +199,55 @@ app.get('/api/files/:id/export-excel', (_req, res) => {
   res.status(501).json({ error: 'Excel export not yet implemented for TKB format' })
 })
 
+// Export docházka Excel for a given month
+app.get('/api/files/:id/export-dochazka', async (req, res) => {
+  const { id } = req.params
+  const month = parseInt(req.query.month) || (new Date().getMonth() + 1)
+  const year  = parseInt(req.query.year)  || new Date().getFullYear()
+
+  const filePath = join(SCHEDULES_DIR, `${id}.json`)
+  if (!existsSync(filePath)) return res.status(404).json({ error: 'File not found' })
+
+  let fileData
+  try { fileData = JSON.parse(readFileSync(filePath, 'utf8')) }
+  catch { return res.status(500).json({ error: 'Failed to read file' }) }
+
+  const input = JSON.stringify({ schedule: fileData.data, month, year })
+  const scriptPath = join(__dirname, 'export_dochazka.py')
+
+  try {
+    const { spawn } = await import('child_process')
+    await new Promise((resolve, reject) => {
+      const chunks = []
+      const errChunks = []
+      const proc = spawn('python3', [scriptPath])
+      proc.stdout.on('data', d => chunks.push(d))
+      proc.stderr.on('data', d => errChunks.push(d))
+      proc.on('close', code => {
+        if (code !== 0) {
+          const errMsg = Buffer.concat(errChunks).toString()
+          console.error('export_dochazka error:', errMsg)
+          reject(new Error(errMsg))
+        } else {
+          const xlsx = Buffer.concat(chunks)
+          const MONTH_NAMES = ['','Leden','Únor','Březen','Duben','Květen','Červen','Červenec','Srpen','Září','Říjen','Listopad','Prosinec']
+          const mm = String(month).padStart(2, '0')
+          const fname = `OP2416101755_TKB_${year}_${mm}_${MONTH_NAMES[month]}.xlsx`
+          res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
+          res.setHeader('Content-Disposition', `attachment; filename*=UTF-8''${encodeURIComponent(fname)}`)
+          res.send(xlsx)
+          resolve()
+        }
+      })
+      proc.on('error', reject)
+      proc.stdin.write(input)
+      proc.stdin.end()
+    })
+  } catch (err) {
+    if (!res.headersSent) res.status(500).json({ error: 'Export failed', details: err.message })
+  }
+})
+
 // Create new file
 app.post('/api/files', (req, res) => {
   try {
@@ -372,6 +422,11 @@ app.get('/api/export-excel', (_req, res) => {
   res.status(501).json({ error: 'Excel export not yet implemented for TKB format' })
 })
 
+// Version endpoint — clients poll this and reload when version changes
+app.get('/api/version', (_req, res) => {
+  res.json({ version: SERVER_VERSION })
+})
+
 // Serve static files from dist/
 app.use(express.static(join(__dirname, 'dist'), {
   setHeaders: (res) => {